When I was a TA at college,
one of my students was a student with special need. He looked and acted completely normal to me. If he didn't show me the paper, there was no way for me to guess he was a special ed. The law allowed him to have 50% extra time on tests and homeworks. When I was a student, most of the times I barely had enough time to complete my tests. I know many of my classmates were not able to complete their tests. Anyway, this student finished the class with one of the highest overall percentages out of two to three hundred students.
Some students and parents are just taking advantage of the special ed program. Of course, I am pretty sure that's the minority.